M C2H5OH=46g/mol1mol C2H5OH------46g0,25mola C2H5OH---xgx = 11,5g C2H5OHZ def. stęż. procent.11,5g C2H5OH-------111,5g roztworu (11,5g C2H5OH + 100g wody)xg C2H5OH-----------100g roztworux = 10,3g C2H5OHx = 10,3%
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M C2H5OH=46g/mol
1mol C2H5OH------46g
0,25mola C2H5OH---xg
x = 11,5g C2H5OH
Z def. stęż. procent.
11,5g C2H5OH-------111,5g roztworu (11,5g C2H5OH + 100g wody)
xg C2H5OH-----------100g roztworu
x = 10,3g C2H5OH
x = 10,3%